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Check the gender number.

Even though Gallade can only be male, the gender number actually does matter because Gallade cannot come from a female Kirlia/Ralts.

If you randomly generate a Vespiquen in pokesav, there will be a 87.5% chance it will be illegal.

Why? Vespiquen evolves from female Combee only. Since there is no way to obtain a legit Vespiquen in the wild, all Vespiquen's must have been female Combee's at one point. Since a pokemon's PID never changes, 87.5% of Combees can never become Vespiquen's.

This means that even though Vespiquen is an all-female species, it must have a gender number that corresponds to a female Combee (roughly 12.5% chance).

Same thing with Gallade's and Froslass'. All Gallade's come from male Ralts or Kirlia, and all Froslass' come from female Snorunt. If you randomly generate a PID for Froslass or Gallade, there's a 50% chance it will be invalid.

As far as I'm aware of, the legit checker DOES NOT detect this.

Pokemon whose entire evolutionary lines are gender-exclusive are not affected. Blissey can have any PID because Happiny and Chansey are also 100% female.